<template>
  <el-container class="home-container">
    <!--顶部-->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition = "false"
          :router = "true"
          :default-active="activePath"
          class="el-menu-vertical-demo"
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF">
          <!--一级菜单-->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconFont[item.id]"></i>
              <!--文本-->
              <span>{{item.authName}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/'+item2.path" v-for="item2 in item.children" :key="item2.id"
                          @click="saveNavState(item2.path)">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{item2.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--内容区域-->
      <el-main>
        <!--路由站位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data: function () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconFont: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠 false:不折叠，true:折叠
      isCollapse: false,
      activePath: ''
    }
  },
  created: function () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出登录
    logout: function () {
      // 清空sessionStorage值
      window.sessionStorage.clear()
      // 跳转到login
      this.$router.push('/login')
    },
    // 获取侧边栏数据
    getMenuList: async function () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return
      this.menuList = res.data
    },
    // 切换侧边栏隐藏与展示
    toggleCollapse: function () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState: function (path) {
      window.sessionStorage.setItem('activePath', '/' + path)
      this.activePath = '/' + path
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container{
    height: 100%;
  }
  .el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    div{
      display: flex;
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .el-menu{
      border-right: 0;
    }
  }
  .el-main {
    background-color: #EAEDF1;
  }
  body > .el-container {
    margin-bottom: 40px;
  }
  .iconfont{
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing:0.2em;
    cursor:pointer;
  }
</style>
